Place this clip right after the failed attempt is shown, so the admission becomes the punchline of the scene. Follow it with a wrong answer sting to underline the error, then a sad violin for a comic overreaction. Save a sharper reaction, such as Nelson's laugh, for a second blunder later in the edit.
About this sound
This is a short Dutch voice clip, lasting about seven seconds, in which a speaker states plainly that he made a mistake. The delivery is flat and matter-of-fact, which makes the admission feel awkward rather than dramatic. It lands as a dry, slightly mocking reaction, the kind of line that turns a small blunder into a shared laugh without raising its voice.